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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a799d55bd9a440aa31621141dad407884b55982bc1a3c8dee3e2f7b9b6b0501' 
  AND token = 'ZwqPihHmhc9Kf01yZYMse6tFSbV+A09Cwau3SiyzWAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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