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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d04b4f2a66fe595ad24e89921141f980f2c1e579c8a2d51be47eda6b951706c' 
  AND token = '/fkXbEyJx61mZpFQHqSsv8XdnFTp84/odqtYfVMO1Ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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