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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca6e1634585cb2226d476ca04956a891ef3c705d91decacb7171c1a34d2f3e9f' 
  AND token = 'XUk07y4eHjDnqJTMC7aiMhvt3H2tnI0qUH7vqRtj3iY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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