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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee4a118db3caad626712bcf196e9008a4b73858e85afc3454e1c35b63a38791c' 
  AND token = 'XhDoEjuXxHMgtmdGr7ePvu7aYsSg4xWdNVduBFVAINY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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