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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d3c844ad9bacb51ac9e4fa520e6ceda72dc217d8a7c0aed3d8081b9a20f6698' 
  AND token = 'ypLekLMnQzA9/8LFqwlu8r7x6CXT+XaT8gJKgc1D1xI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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