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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d9480edfbb02d7504645fd7bafca0a9c5bc7e81ec7035651cd8ba20fc324bb6' 
  AND token = 'co/rQtwS+D1k2LF3W96ew0rgLI5hLsTrGqYkxUd/6cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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