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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf5fdb5600b6c1f5319eb48b629fd57b8cf8bc4b6bad2aec34c019a0f12b31a3' 
  AND token = 'o16xPgCyFW/1pX66f05szR5biycrXpPI58J9d6ST1qU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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