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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec954fdeb13e5e5e86e8a01f0e418456dee820054393d6183356e6bb756e43a8' 
  AND token = 'CmeZ7ugAg2RsTE3pKg1XUy0k5XqIrzbwgLL6Pqqtc24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00139

JSON explain

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