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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd84eb760832e60b75607a4e21e1aba8f86d24ce90431bcedb468fcff73aa3197' 
  AND token = 'fYmZI3B4KeHZGcxf8bBbP/8ebhm5i1Jjcr8n/2VKhGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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