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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9015e079955ccc2a1e6010de07798bdd064158b33c5819fb3b719a0e2e0f6ba5' 
  AND token = 'dB5HsYxaU8q9xcvl5n3dknfe/sUug1OkAvLvc2vzWFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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