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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34afa3352840211ae5fb009a9acca8be175c4293a50020570053fc38d36ddf04' 
  AND token = '5sTe9jZVKrl7jmrd1s07iYqjT7MotwZAuEGS3mD0FsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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