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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca51eda7dc31c9e9aa442a15152d389a382c8f9ec16dfdaa4438d7dc0e33c7ff' 
  AND token = 'BKIPbLWXldMS2sY/3l5wnIH9aTs5NClEos4HnHS5xsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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