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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '690c8d75ef783fa04cf762542dfb3cd218ae6cb1e00f90b2a3e825ba7563fcd3' 
  AND token = '+hGIiBKkTXQfr3Li5bXGd2iz28UrFerodJULV1az4Ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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