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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0da50e38308454401b1c21f3c833c1322bac35acda446da2379ab15eece1ab77' 
  AND token = 'l4Vj1owO5e39Vra4fQn7pWstXPezFIgG4eh+F6d8I+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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