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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '039ff089786402ec58f3369e680fe85be0680de138c3b563e58181021345fc21' 
  AND token = 'kT37nNo7l7ZuQvXR/VURXVHrzxJhP99Wv9DjD2QN694=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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