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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9d6441c7443c7befe6e2001443969baab55b49763b8847dd13f1cc3f981e6a0' 
  AND token = 'OXJa/R3obDl0SD0XdO+PQpC0HE4ZgopeD0skpqt4FTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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