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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e637cab8ff6f2bbf8aa80dac40708ba66f8cc38e146e27f18bff99933c436bc4' 
  AND token = 'wFQPN3L+D1xLj/81m3LviamIAuoDyM7WHw6GGvxzu68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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