SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61972f59a0c09d35de5bd7214e15d62c2042b2f9ff87c844c199632bc468a5a0' 
  AND token = 'IKucnNrCUlYkumT5KxdixYHZGRhPEIkF2MIGBIfjjp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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