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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e71d85ef947d25a2c2780519216b5120ea0241b01058e9e74b5dfd870243abc' 
  AND token = 'D7aJudgsjJcxJNh6Y45aqkLFTr+3AKxfuKlOcl4YulU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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