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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd7c43757017fbd31cb95f0a72fc95d49060c4bad4aaf691db70fdc6f9a3ab34' 
  AND token = 'Td88nm9j1M+XRhFCIYiVzKRNFsSee3I4JOdmmgv9z0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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