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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e9d3ea6029f36492e4e639117c662bbca5e59e7c0af87fec1d4734c823eb3a6' 
  AND token = 'XBoQbih3ssH4OYFmWTSRGqObEQE9xEqtynfAg9BbJd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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