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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80a48426ea06182b5b02e27a95f24f04f7cf98ea101a8e8997da0be8f76aa2c1' 
  AND token = 'UNaXNNfSrPBX7xo5c1X2+MvICVxzpEHdI/COZPjE7j8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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