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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbd7be992e12f27f80f30bd161d919c758e8bb118bf3b2c199406f004a37c8a9' 
  AND token = 'Tmdx048HuRM9zbjp5FMUs4qlHEjNANgS3sQHSt9OYec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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