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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12cf44f47942a7bf5e76ce7b4e8a1c16c8c90872144ac134a991fecbc53df111' 
  AND token = 'b1VD2g2IBe4qVcBp9r5BYhBF9Skxc3wWsWnncVUwq8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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