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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51097e062c287f4f93de14d18bba84fd6d0c5fcedab20e853f3dea9943383d5c' 
  AND token = '3LyAA7OvZwWH1e6OYgUmBJf8QqeU+e7/Jt7xZd8gSQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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