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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02acd4de113abf39741561b912246ca82fc59b414e63b3ea1d14d5041d7ec82e' 
  AND token = 'Cq4WgJZRTOsT17xsd8jeCS4msQUxHx+GAsW0ZtJDGVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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