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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4279ba4ee71320f8d0dfa8d10c585523e2528094e5b8e61f9334b0570f851924' 
  AND token = 'Or27Enr92B4u5T8el1JwofE9SAW0VJIbmPr8qjxgJYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}