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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b02f63da36d26537fe0771cdd8efaf30923f1e17b14bc2f11cfffcd74a6d391' 
  AND token = 'A11I5eFoLD2GPX9aDfcoC1In1HFjx6nC0isiJ3XwdV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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