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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58e8b93576a171d8b3b5462188f569349ff37b6498f0bac8db18992067d56849' 
  AND token = 'DGZcDKRyrR+iL19XqbNQ3rm5MsVIXCnh06gHUjX5sf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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