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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '648e3073cbadbd8ba6181f880e2c80c91f10352b29e0763167ed842c90729453' 
  AND token = 'RzcZ/30SxBFAh9oXr/aNXibKJV6OTTNkfJ1i/RBjHRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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