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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7431d83cce292ac196d25844200da04ba9d57aa82c8f436494f75c615a088c5a' 
  AND token = 'Azj2fKpSOnr9O+P0PtPGpZc0yw7V+8npEkXMZAwjaYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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