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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8700e001e6a1b07b445673faee578d9c2c7c5f909e9be1799cc9f56ff73a3e9' 
  AND token = 'QluyOwkNXNHqH7ZPa1vN675rcgMj53bpkmO04LBSeVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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