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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88d3a7cadfeb757fe806495c0b8e3f6751ecaeb478b9d83dc991f84007b68e7f' 
  AND token = '0YitBZTrgrjZOKDaj1OX/2aCFAv7lHAtcItyLu1mQO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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