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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e6bda1f30522bfb5f20928e5b5eb11eb4af9697add1920b3afd4aef26e3a20c' 
  AND token = 'YXTNuRg2anVZQZAypZZvw8qvvxwboo9hOub37IMU30M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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