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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7e5a766acb65aebb2c416809f4cd2cfe210e6b4e33fda24219ddbdf2d724837' 
  AND token = 'IxPK4EvOBzOhkpIOA+dSIYuHWd+orZ//2Q5866geUUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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