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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '019c9c5ed273016e9cd46e6b1f16ed9ef51526e6732a4674fd6f331cab1664ff' 
  AND token = 'CKf6c1tM+bvULPHReAYk0r5km267EQVPA4xFqcnFg3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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