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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5030c1af1cb921dabadd56aad2eec12f764607fc6ea5307782b0c974269e271' 
  AND token = 'fXlWE923DC8NRkX/DDNzFV4V38GsGzyBKJcg6yhyk3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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