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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d4b1c75687590ff92add8714ea50f0fc2497b758be1795081af15d465501103' 
  AND token = 'xjFgoyAJ4Ds13mhRT2dqkKI/lh0g49C4gbMudkz2Jmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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