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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebf8b5d4e2a6f85de58eaa91e1192e078adfd084783b031736a4860c138efa60' 
  AND token = 'Md0OA38FRmqVCqFjyrMNIHj0oenMpX8OdRhr1meuC5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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