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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67710e7ae361004e5ad138bca5577b939d6f767be0db622dd24702c75d20652f' 
  AND token = '44vaW3ydwy9gPvFbxYXt4IEq88imYGJ3cObo025Ett4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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