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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd6eb8409ae4b80bfe7d04a4cee9c9e6e9aeb4b23ac8fd518defe4d59cd80fb7' 
  AND token = 'cbP1SlGS66jS5FhtTGlq7aj+GGfHjJ9qx31eZv0eeVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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