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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bee57eef4b01f72571a7aeb2db9df173842a0184568c940ee20036e1dd4ae3d0' 
  AND token = '4wia+5KcRSpi+13AqRxtB9w5ZQDf+RQ8b3lmApZ1pCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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