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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31ae44f29c6660a1c428bd47555e1b3612d79fb93192f17ae5e2a690957cdbaa' 
  AND token = 'JEsglLrgaQldvl+AryHb1QGJ80TUASbk9eGIlOdnj30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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