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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04512d9a7b06ce33257eb7f5ba74e5ee8294732346e4fdae33a8647a132bf992' 
  AND token = 'AmpuQMGB+vFa0tAEF1M3UH3LO5hUYISUj07IjaEo8hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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