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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d764fca1634b58e412547d650e9da0907a79d8bd9d51e8875499a4b18bcb171' 
  AND token = 'wjbJhBKPzc9PFrVDXwoQ64VJbmefnYT1dzdDHmsSEYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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