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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b79118e7587d342c0055effc863c1b92e540792fa7ff9eb900ab1048b62a570' 
  AND token = 'x368lm69RaS8tJ7AXzMG/247Dj44jWg1AxlK+Fig/38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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