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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '767e52e62a919982997fc0c5d0a11cc02d427b3976305ba7f5476bae11f13611' 
  AND token = '2oNQlW0Q+60nqMDiqOzqV1K7T05kgp7UQN2r+FRNj/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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