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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba61907d6576a5270fcd645a8f491e0a38ebd038b8b39ead8f20ed2b143f7c1c' 
  AND token = 'uJ4B6YE+YY6xUNXZ4C8Hur0VRocouEittGvRKeWsG6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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