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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '791965242d29824375bc0a81b265bf3aa41d2257158892ab6fa731e63586349a' 
  AND token = 'Huoy58+u7fmoVqdc/cMro14rhj0e4IUEQQyuHH6wyjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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