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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdcbad80d37fe13af2d673019e7402883d82602eaecba74d676158c610788b0c' 
  AND token = 'F/zlZLGmDCbmCKB6ZSs5N1KcSrZkcSZBq5tiggBC9wI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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