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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af85d28b72540a3324fd287b66295564ab4e47154c452324a126c1dd9574af67' 
  AND token = 'CC2BsxIEL7A9eAOBTKVy+SH1+QBV6QlnHhU3lVF9HNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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