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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e6e673f9c208fb535380a058f4eab81e7b199b5b2013748f262b1aee4d8e93f' 
  AND token = 'rPIfFVzvHe8bLl9ndtIVqgipW+nF0P1MUBAq+e+92Rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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