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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68c68fc6872d2a28d05a6f93d88af8961fb3b6df9a542b237fe98e815b669197' 
  AND token = 'bweEQcgNEn5BTXBNzVnEOkIkvuLw7gX+rawaZDP8fdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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