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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '219a95ba74e058ce7617e7fc7f82a2dda074a139d98688ed94cea90392cc4f19' 
  AND token = '3ZADEko4MpFKD9O1TeZb9eCb1ffKYq+ksL90yI5W1QA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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