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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93ef2f885cb891c556c61379abbd1b7eb4e34e04c728e3c09f4fcc13d0661154' 
  AND token = 'UdZ6oC+5A3TJRsj9QcLvknM/qAgA0MBjNeKosPvVNNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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