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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e76e9fb876fab7381ba696fc94eb781d48770ca9ee2869b85991d1682a3ba2d8' 
  AND token = 'zGEjo/64GGtufKWyqK31rb6q5d7CoYNKf5ht2PlyjM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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