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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '471a11eda55b47ba4ea6f8bc3146a6ab2cc6be5db0763681524e157ef86b7985' 
  AND token = 'C7tGvsvYRFqaQqFAvbYtv4mj4o89Q3QTiEYQYu0ylks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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