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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cceee8fb9e4fd394d3d0c41d79dd06ece2510123b1a343b4e6edc3d6058cc719' 
  AND token = 'hnldZRIacGyTsf57smm0kpe9rtxrJB1vuQFXQ+OHKyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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