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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa311f389af3da7f390cfafe0f0f9774a359e4e498f511068269b08447539c8d' 
  AND token = 'asIN4Yd7lBBp2fiG5bRejoL8Pjz2W0bHjUQcAzFnngs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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