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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc2093996dc8ce57ea52c9284a04118f22cbc07e188906f23dd7c27f794ca0f1' 
  AND token = 'jF9gUIbwNua4Yt3QSstI/gd0vHhX58+PgIX+h+f307Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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