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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '830bbe9356cc44da4c9c8164a2763a225c818ed498752282ffe82db9a9ef1193' 
  AND token = 'ZoMFTjr1Q0MTrJFoLoSN8TT0VG0UAuhZxBt7nrgVD04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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