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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79839706473fe8aa8d819d902c2a210f251502fd1b1411d97d4a302a48c1f30b' 
  AND token = 'u4o2Dq2ndGlj3Z1EAjdpN0qV0ZRcy9v/gGa1YbUT89w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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