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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aeafb5a4f7d71b6023d18110cd9db36404b81de202aa9cd7bb55bf80a6ec9ac' 
  AND token = 'H598hOfb940+f777q/4Lf+8WgsubkMhwe9X7DOI1vQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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