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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3eb5b7f8c44beb8729e409007a62e0855da94821f526466f0d195234a888458' 
  AND token = 'oABgx7EpFtMhNzWEfQdNn5cnBcDAjtQOq1+NaJy0B6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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