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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e3de8043ddc3aaeceff1cccc7add4002f92ea3ca31ad1f1e9b54180f7ae7362' 
  AND token = '/Gfs2yvuz0RVOkgQ1dWbaIrOOvnaWBDBMox9DIigAEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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