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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf2262b71fe705088ff00968f7eceb205003b4ff30aadf462890c4d0554f6ab8' 
  AND token = 'u70e66EPT23gWIDwgydwjKqRVh/qWD1hjyis1ML7shU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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