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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8777be40a1d696c3f88d074a16282bb6a01399d7654ccdad61cff2875479a699' 
  AND token = '3lOxbzMHngd5Y1D2BAOyPWhet47KawOHHDFIbXqHvEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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