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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c59a1e88989493dc8e631ea2679c719d8e6deb39da98155f0ac0793c1fb47f6' 
  AND token = '5r8cbrbmTgaIKrzla7b4v1dblqIDveGiGcrG3rSPj8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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